Kenpo means mother for a reason. It's not meant to mean wife. Mom needed to be present for a while when Dad needed to hide, and there are several places where the man who fronted Dad actually did practices in his spare time and payed attention while letting Dad play through. Often Mom would have children by such men and if there was a worthy daughter she would stay as Kenpo when Mom left. Women in our culture who live at home are not forbidden from finding a breeding partner they aren't married to, they don't get together physically to have children and the woman doesn't always bear the children herself, but its not that uncommon for her to find a number of daughters, nieces and sometimes sons who are suitable to benefit from her personality and situation. Of course if she finds sons she either only takes in lower nieces or finds them other situations unless they are compatible with her son but I don't think I've ever seen that situation, that takes on another configuration similar to something being set up in my family but doesn't have a place in space at this time.
We have understood about reproduction for a very long time and decided that when people are made to choose between a child from their own marriage or a child that can help them on the farm or in the business, they prefer a child who can help them as long as they can raise them. When given a choice between doing whatever they want whatever the consequences and raising one of our children in return for getting many of the things they want in life a lot of people choose to raise our kids for that reason too. But some people don't. And thats fine with us, but as I said before Kenpo means Mom so its ok to choose another way of life and sometimes that means, usually that means you go somewhere else to do that, and sometimes that means we take what we do to another group of people and let you do what you want where you are. But if neither of those options is acceptable people who do things our way are better problem solvers and tend to have more understanding of the resources they have.
*when people raise our kids they don't adopt them, they foster them or apprentice them. When it seems they inherit from these people its not really inheritance but sweat equity as often these kids have done a lot of uncompensated labor for the people who raised them to a profession. Depending on the nature of the kid, they could be sent to a farmer or a tradesman but sometimes they have been sent to royal or noble families and have participated in governments*
